Poll: Which is the best MLS rivalry?

Thursday night's classic between the Galaxy and the Earthquakes [WATCH HIGHLIGHTS] adds yet another chapter to the long history of memorable — and usually heated — battles between the two sides. It's a true rivalry born of years of scrapping for titles and, at the very least, honor.

But the MLS season boasts plenty of fixtures for which fans eagerly mark their calendars. Some are geographic rivalries, while others evolve naturally simply because the two teams share a dislike — a hatred, perhaps — for one another's fans and players.

It's all in good spirits, though, but which one's the marquee matchup? Which rivalry is a tussle not to be missed? Vote now!